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Two families of colour rendering judgements. F. Viénot, E. Mahler, A. Rambaud, M.-L. Durand, S. Bailacq, C. Boust, J.-J. Ezrati, CRCC, Muséum national d’histoire naturelle CIE, TC1-69, Budapest, June 2009. Two families of colour rendering judgements. Fidelity Discrimination

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two families of colour rendering judgements

Two families of colour rendering judgements

F. Viénot,

E. Mahler, A. Rambaud, M.-L. Durand, S. Bailacq,

C. Boust, J.-J. Ezrati,

CRCC, Muséum national d’histoire naturelle

CIE, TC1-69, Budapest, June 2009

two families of colour rendering judgements1
Two families of colour rendering judgements

Fidelity

Discrimination

Preserved metamerism

Naturalness

Chromatic consistency

Transparent clarity

Skin tone

Comfort, relaxation

Harmony?

Colourfulness enhancement

Appearance

Brightness

Attractiveness

Beautification

Chromatic clarity

Selective chromatic contrast

Conspicuity?

colour rendering discrimination
Colour rendering - Discrimination

RGB

Solux

  • Distribution of errors

Mahler E., Ezrati J.-J., Viénot F., 2009, Testing LED Lighting for Colour Discrimination and Colour Rendering. Color Research & Application, 34 : 8-17.

colour rendering appearance
Colour rendering - Appearance

RGB

Colourfulness rating

  • Distribution of colourfulness ratings

F. Viénot , J.-J. Ezrati, C. Boust, E. Mahler, “Grading LED illumination: from colour rendering indices to specific light quality indices”, CIE 26th session D1, pp. 22-25, (2007)

a paradox
A paradox

RGB

  • Colour discrimination impairment

AND

Colorfulness enhancement

CIELAB colour specification

two families of colour rendering judgements2
Two families of colour rendering judgements
  • Other works
    • Szabó F, Schanda J, Bodrogi P, Radkov E. A Comparative Study of New Solid State Light Sources. Proc. CIE 26th Session, 2007, D1:18-21.
    • Y. Nakano, H. Tahara, K. Suehara, J. Kohda, T. Yano, “Application of multispectral camera to colour rendering simulator”, AIC Colour 05, pp. 1625-1628, (2005)
    • Rea Mark S., Freyssinier-Nova Jean P., 2008, Color Rendering: A Tale of Two Metrics, COLOR research and application, 33: 192-202.
    • Van Kemenade J.T.C., P. J. M. Van Der Burgt , "Towards a user oriented description of colour rendition of light sources". CIE 119 - 1995 - 23rd Session, New Delhi, pp. 43-46, 1995.

See also CIE, Beijing, 2007

    • S. Jost-Boissard, in this conference
    • Fotios, in this conference ?
a vector field
A vector field

Van Kemenade J.T.C., P. J. M. Van Der Burgt , "Towards a user oriented description of colour rendition of light sources". CIE 119 - 1995 - 23rd Session, New Delhi, pp. 43-46, 1995.

VIÉNOT F., BENHALIMA F., BRETTEL H., BOURDONCLE B., COLONNA DE LEGA A., 2002, Rating of tinted ophthalmic lenses, in 9th Congress of the International Colour Association, Proceedings of SPIE Vol. 4421, 271-274.

We proposed two statistical indices: “norm” and “disorder”

two families of colour rendering judgements3
Two families of colour rendering judgements
  • Fidelity and colourfulness cannot be achieved simultaneously.
  • Different tasks and objectives, different visual mechanisms.
  • We need different indices,
    • sort CQS ideas
    • revise CRI, see TC 1-33 update
    • create new indices
  • Incices should give precise information (field vectors)

J. Schanda, Color rendering of light sources, In: János Schanda (Editor) Colorimetry, Understanding the CIE system, Wiley, pp. 207-217.

W. Davis, Y. Ohno, “Toward an improved color rendering metric”, Proc. Solid State Lighting V, SPIE Vol. 5941, pp.283-290, (2005)

slide9

Issued May 2009

The book begins with the principles of LED lighting, then focuses on issues and challenges. Chapters are devoted to key steps in LED manufacturing: substrate, epitaxy, process and packaging. Photoelectric characterization of LEDs, Lighting with LEDs and the imposition of a certain level of color quality, are the subject of later chapters, and finally there is a detailed discussion of the emergence of OLEDs, or organic LEDs, which have specific capabilities of immediate interest and importance in this field.